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XP - User Can't Logon

I've got a rather odd problem going on with my home desktop (XP Home).

Desktop only has two accounts, both set to administrator. My account that I always logon with works great, no problems whatsoever. However, anytime I try to logon to the other account from the Welcome screen, it shows the usual text of logging on, flashes the desktop, then immediately logs off, returning to the Welcome screen.

So I checked a few things while googling about:

(1) To my knowledge I haven't been infected with Blazefind. I have no unusual search bars, and my BitDefender + Adaware + Spybot setup has shown things as pretty clean for a while now.

(2) HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT
\CurrentVersion\Winlogon is properly set to userinit.exe (as opposed to wpaupdater.exe -- evidently another common cause of the problem).

Again, the main logon I usually use continues to work fine -- It just appears any secondary account I try to create fails to logon now.

Any thoughts? I'm about to run a chkdsk /r next to see if it has any effect.

/edit -- Ok, got some updated details.

Ran chkdsk /r, and sure enough, after that I was able to logon onto the newly created second account. Once. Logged off, then logged back into my main account, then logged out, and tried to log back into the second account a second time. The problem returned.

The most common cause of this right now, is running a malware detection progam that deletes a file, but the registry still points at it. This, wsaupdater.exe, seems to be the most widely seen culprit, but it could potentially be other things, too.

About that faster user switching -- I've been suspect of it. I disabled all services associated with a while back, since I was only using one account. Since creating a second account, I've tried re-enabling the services. It's entirely possible I missed a service; I'm not 100&#37; what all services must be started to have it fully enabled.